Condenser finning machine



July 1, 1941. w. OBRIEN I CONDENSER FINNING MACHINE Original Filed Oct. 26, 1936 9 Shegts-Sheet l ATTORNEYS INVENTOR William L. OBrzlen QM 44 W} July 1, 1941. w 1 QBRlEN 2,247,730

CONDENSER FINNING MACHINE Original Filed 061.. 26, 1936 9 Sheets-Sheet 5 INVENTOR William 11. ()Brien 9 SheetsSheet 4 INVENTOR William L. 0151-6611 mum/ M ATTORNEYS W. L. O'BRIEN CONDENSER FINNING MACHINE Original Filed Oct. 26, 1936 BY mi 12605;,

July 1, 1941.

July 1, 1941. w Q'BRIEN 2,247,730

CONDENSER FINNING MACHINE Original Filed Oct. 26, 1936 9 Sheets-Sheetfi 209 2 ,3 2-32 232 208 226 2: 38 mvzwroa 28g: WL-llzam L. OB -ten 284 r Me 7 ATTORNEYS BY M9 44 w. L. OBRIEN 2,247,730

CONDENSER FINNING MACHINE Original Filed Oct. 26, 1936 9 Sheets-Sheet 7 July 1, 1941.

NEYS

ATTOR INVENTOR William L. OBrien BY @8114,

I 1.. L-n n www m wiww i lllllllllllll 1| m r 3E:#:9552255: US$57 M w fiww lwl T i im I I Z g g 2 5 22555? a:

1. FL FL FL rL rL r, \& 2

l M 3 i m w l a 22 Z .1

July 1, 1941. w OBRlEN 2,247,730

CONDENSER FINNING MACHINE Original Filed Oct. 26, 1936 9 Sheets-Sheet 8 INVENTOR William L. OBren July 1, 1941. I w L, QBRIEN 2,247,730

' CONDENSER FINNING MACHINE Original Filed 001:. 26, 1936 9 Sheets-Sheet 9 INVENTOR Will mm, L. OBI-Jen BY AfTORNEYS 7 Patented July 1, 1941 2,247,730 CONDENSER FINNING MACHINE William L. CBrien,

Delaware Evansville, Ind., assignor to Servel, Inc., New York, N. Y.,

a corporation of Original application October 26, 1936, Serial No. 107,739. Divided and this application August 17, 1939, Serial No. 290,568

10 Claims.

This invention relates to sheet metal working machines, and more in particular to machines for making condenser fins from sheet metal and for placing the fins upon condenser pipes.

An object of this invention is to provide an automatic machine which will make sheet metal members and place them in spaced relationship upon longitudinal members, such as pipes.

In the illustrative embodiment shown:

Figure 1 is a side view of the machine with the fin-material-holding means (shown at the right) moved up to the press and with a portion of the adjacent brake control rod 95 cut away;

Figure 2 is a vertical section of the machine;

Figure 2a is a view of the main power shaft from the line Inf-2c of Figure 2;

Figure 3 is a view of the machine from the side opposite to that shown in Figure 1;

Figures 3a, 3b and 3c are detail views of latch means later to be described;

Figure 4 is a view of the means for assisting in holding a set of U-tubes in position;

Figure 5 is a view showing the U-tube-holding means and the fin cutting means;

Figure 6 is an end view of the elements shown in Figure 5 with various portions cut away so as to show the detailed structure;

Figure '7 is an enlarged view of the fin cutter;

Figure 7a is a sectional view on the line la-la of Figure 8;

Figure 8 is a horizontal section of a portion of the machine in the path of the fin-material feeding therethrough and showing (at the lower part of the figure) one of the followers in position to receive a fin, together with the structure for controlling the position of the followers;

Figure 9 is an enlarged view similar to the lefthand central portion of Figure 2, showing the fincutting means and the follower control mechanism with portions cut away so as to show the details;

Figure 10 is a view similar to Figure 9, showing the follower control mechanism in a different position;

Figure 11 is a sectional view similar to a portion of Figure 2 but showing the parts in a different position;

Figure 12 is a vertical section of the follower moving mechanism;

Figure 13 is an enlarged sectional view of a portion of Figure 12 showing certain details;

Figure 14 is an enlargement of the right-hand central portion of Figure 2;

Figure 15 is a vertical section showing the details of the safety stop mechanism;

Figure 16 is a side elevation of the safety stop mechanism;

Figure 1'7 is a view of the stop shaft showing the elements which are rigidly mounted thereon;

Figure 18 is a view from the right side of Figure 1 showing the stitcher for connecting the strips of fin material to each other to insure continuous feed, and the oiler mechanism;

Figure 19 is a top view thereof;

Figure 20 is an elevation of the stitcher, showing the element (which cuts the ends of the strips of fin material preparatory to stitching) in the down position, and with portions of the various elements cut away so as to show details of the structure;

Figure 21 is a sectional view on the line 2l-2i of Figure 20;

Figure 22 is a view similar to Figure 21 but showing the cutter element in its upper position; and

Figure 23 is an enlarged view of certain parts shown in Figure 21, showing the cutter (at the left) in its upper position and the adjacent stitcher in its down position.

This application is a division of my copending application, Serial No. 107,739, filed October 26, 1936, and entitled Condenser finning machine, and issued on December 10, 1940, as Patent No. 2,224,549.

In heat exchange elements, such as condensers, radiators, and evaporators, where it is desirable either to add heat or take heat away from fluid within tubes or pipes, metallic fins may be provided upon the tubes to carry heat from or to the tubes, as the case may be. In the manufacture of these heat exchange elements, the tubes may be made up of U-shaped portions upon which the fins may be placed. If desirable, a set may include two or more U-tubes placed parallel to each other and the fins may be placed upon all of them at the same time. After the fins are in place, the U-tubes may be joined together so as to form a continuous circuit.

The preferred embodiment of the present invention is a machine for making the fins for a condenser from a strip of sheet metal and for placing the fins upon U-tubes in spaced relationship.

Referring to the right-hand portion of Figure 1 of the drawings, a strip of sheet metal, which is the fin material and is designated by the nu- .meral B, is shown in the form of a coil held by a holder Ill. The end of strip 8 is unwound and extends to the left through press I00 which has (as best shown in Figure 3) a main power shaft I34 driven by motor I40 through belt I38 running upon fly-wheel pulley I36, there being a fly-wheel clutch of any usual type (not shown) connecting fly-wheel pulley I36 with shaft, I34. Referring to Figure 2, during operation of the machine, strip 8 is advanced to the left through pass I where rows of flanged holes are formed across strip 8 at spaced points. To the left of press I00, in the path of strip 8, is cutter I50 which, as best shown in Figure 9, cuts from strip 8 individual fins.

Referring to the upper portions of Figures and 6, particularly the latter, directly below the flanged holes I09 in the strip end 9, when strip end 0 is in position to be cut from strip 8 to form a fin, are the ends of a set of three U-tubes I which are held in place by the large sliding rack I42. Fitted upon each end of each of the U-tubes I 4| is a round-nosed plug I44 which is held in place by an extension I45 which extends into the end of the tube. Plugs I44 have a maximum diameter the same as the outside diameter of the tubes, and are adapted to enter the flanged holes in fin 9 and effectively position the ends of the U-tubes therein.

Referring to the left-hand portion of Figure 2, a plurality of angularly shaped followers 202 are carried upon two endless chains (only one of which is shown) and are the active elements of the fln-positioning means. from strip 8, it is pushed by a follower 202 downwardly along U-tubes MI and properly spaced thereon.

Referring particularly to Figure 2a and the upper right-hand portion of Figure 2, the main shaft I34 has rigidly mounted thereon two eccentrics I0I upon each of which is mounted a pitman I05 which extends downwardly and upon the end of which is mounted plunger head IOI. Plunger head IN is adapted to move up and down, and in such movement is guided by means (not shown) upon the inside of each side member of the press. Upon the bottom face of plunger head IOI is fixed the block I02 of the perforating mechanism which is shown enlarged in Figure 14.

Directly below the block I02 is the anvil I03 of the perforating mechanism. Elements I02 and I03 cooperate in such a way that rows of holes are punched in the strip of fin material traveling therebetween, and then the metal around each hole is expanded into a flange. Each row of holes extends across the width of the strip and is so positioned that it is along the center line of the metal that will later be a fin. There are six holes in each row, and the remains for producing one of the holes is shown in cross-section. This is a cutting pin I04 fixed in block I02 and a cooperating hole I06 in anvil I03. Surrounding hole I06 is an upstanding sleeve I 08, and surrounding pin I04 is a sliding sleeve II2 which may move up and down relative to pin I04 in the circular opening I I0 formed in block I02. The lower end of sleeve II2 slides freely in collar II3 which is rigidly mounted in block I02, there being an enlargement upon the upper end of sleeve II2 which acts as a stop means. Surrounding the upper end of pin I04 and exerting pressure upon the upper end of sleeve II2, so as normally to hold sleeve H2 in its lowermost position, is spring III. After cutting pin I04 enters hole I06 and as block I02 moves farther downwardly, sleeve I08 enters recess H5 in collar H3 and, in doing so, forms an upwardly extending, sharp-edged flange I09 (see Figure 6) around As each fin 9 is cut a the hole, the flange entering recess II5. Recess I I5 is slightly larger in diameter than sleeve I08 so as to allow room for flange I09. During the latter portion of the movement of block I02 downwardly, sleeve H2 is engaged and held stationary by the upper end of sleeve I08. As will be explained later, this flanged hole is formed to fit upon a condenser pipe.

When block I02 has reached its lowest position and starts upwardly again, sleeve H2 is pushedzdownwardly with respect to block I02 by spring III, so as to free the flange I08 from recess II5.

As best shown in Figure 2, the material cut from strip 8 in forming holes falls to the bottom of the press through suitable openings to a container III. The forming of flange I08 is facilitated by oil which is placed upon the bottom surface of strip 8 as it enters the press by the oiler 4 I I.

Referring again to Figure 14, to the left of the hole-and-flange-forming mechanism and mounted upon block I02 are a pair of material-centering pins II4 which, upon each downward movement of block I 02, enter two of the previously formed flanged holes, pass through the holes, and enter openings H6 in anvil I03, with the result that strip 8 is definitely centered during each downward punching operation.

Referring to Figure 2, rigidly mounted to the left of anvil I03 upon shaft H8 is shown one of a pair of arms II9, upon the free end of each of which is pivotally mounted a feed finger I20. The right end of each of feed fingers I 20 is urged downwardly by tension spring I22, the other end of the spring being attached to the frame of the press. The left ends of feed fingers I20 are adapted to .enter holes in each row of holes in strip 8. The left end surface of each finger I20 is vertical, while the upper surface of the end of the finger is sloped to form a cam, so that when feed fingers I 20 are moved toward the right they will be depressed and retreat from the holes; but when they move toward the left they will enter and remain in the holes and advance strip 8 toward the left. As best shown in dotted lines just below the center of Figures 1 and 3, ,shaft H8 is actuated by arms I2I mounted near the ends thereof which, in turn, are actuated by rods I23. The other ends of rods I23 are carried by arms I 24 which are fixably mounted upon shaft I26. Referring to Figure 1, shaft I26 also has fixably mounted thereon arm I28, the free end of which carries one end of eccentric rod I30. The other end of rod I30 is carried by eccentric collar I 32 mounted upon eccentric I33 which is fixed upon the end of power shaft I 34.

Upon rotation of shaft I34, eccentric collar I32 and rod I30 cooperate so as to translate the rotation into an oscillating motion at the lower end of rod I30. This oscillating motion is transmitted through arm I28, shaft I26, arms I24, rods I23 and arms I2I to shaft II8; with the result that (see Figure 2) arms I I 9, and with them feed fingers I 20, oscillate ratchet-wise through a definite path of definite length so as to feed strip 8 in measured steps.

Eccentric I33 is mounted upon power shaft I34 so that this path is such as to cause feed fingers I20 to advance strip 8 a distance equal to the width of one'fin, and so as to move feed fingers I20 to the left and thus advance strip 8 while block I02 is raised and is thus free from strip 8. In this way, feed fingers I20 advance the fin material the width of one fin immediately after a row of flanged holes has been formed, and then are returning so as to enter holes in the next row during the time that block I02 is engaging strip 8 to form another row of flanged holes. Thus, the holes in strip 8 are spaced in a definite relationship with respect to the cutter'and the holeforming mechanism. The extreme position of fingers I20 to the left may be controlled and determines the exact position of strip 8 during the hole-forming and the cutting operations. This allows for ready adjustment of the width of the fins and, at the same time, avoids errors which might result from inaccurate movement.

As best shown in Figure '7, cutter I50 includes a fixed cutter element I 52 and a movable cutter element I54 which cooperate with each other so as to cut fins from strip 8 and, at the same time, trim the corners of the fins. Fixed cutter I52 is mounted upon base block I53 which is carried by the frame of the press I00. Referring now to Figures 5 and 6, movable element I54 is adjustably carried by sliding block I56 which is mounted upon guide pins I58 so as to move vertically. Guide pins I58 are slidably mounted at the top and bottom in bearings, the lower bearings being carried by base block I53, and the upper bearings being carried by block I59 which is mounted at its ends upon base block I53.

Referring again to the central portion of Figure 2, extending from the left side of plunger head IN is actuating arm I60, the end of which enters a recess in the right side of block I56. Due to this construction, as plunger head IOI moves carrying block I02 it also carries with it movable cutter I54; and when the movement is downwardly a fin is cut from the end of the strip. Simultaneously, a row of flanged holes is formed in the strip between block I02 and anvil I03. As pointed out above, the spacing between block I02 and cutter I54 is such that as strip 8 is moved the width of one fin in the interval between two downward movements of plunger head IOI, strip 8 is left in a new position such that a portion of strip 8, equal to the width of one fin, extends beyond the cutting edge of cutter I50. A row of flanged holes which were formed during a previous downward movement of the block I02 is spaced along a line which is the center line of the extending portion.

Referring again to Figure 7, the cutting edge of the fixed cutting element I52 is formed of five distinct portions, each of which cooperates with a corresponding portion of the cutting edge of the movable element I54. The main portion of the cutting edge of the fixed element is straight and is designated by the numeral I62, and terminates at its ends in arcuate portions I63. Edges I62 and I63 are in the horizontal plane of surface I64 which is the plane of the path of strip 8 as it travels through press I 00. Spaced slightly below surface I64 and in the horizontal plane of surfaces I 61, are arcuate edges I66 which extend from, points which are in vertical alignment with the points of juncture between edge I62 and edges I63.

Fixed cutter element I52 is cut out behindedges I66 and below edges I63 so as to form recesses, of which the bottom surfaces I65 slope downwardly and backwardiy. As best shown in Figure 7a, these recesses open into passages I68 in base block I53, which (see Figure 2) communicate with chutes I10 leading into the bottom of the press. This facilitates disposal of waste pieces cut from strip 8.

Referring again to Figure '7, the upper cutting member is provided with a straight center edge I68 which terminates at its ends in arcuate extending edges I12. Edges I68 and I12 all form edges of horizontal surface I14. Spaced above surface.l14 the same distance that surface I64 is above surfaces I61 are arcuate edges I15 which form edges of horizontal surfaces I16. Movable cutter element I54 is cut out upwardly from edges I15 and I68 so as to form a recess I18; and thus the upper cutting member fits over and registers with the lower cutting member.

Edges I68, I12 and I15 are in vertical alignment with and are of the same size and shape as edges I62, I66 and I63, respectively.

In explaining the operation of the cutter, consider that a strip of fin material 8 rests upon surface I64 and extends beyond edge I62 a distance equal to the width of one fin (as shown in Figure 8). Referring now to Figure 7, as movable cutter element I54 descends, surface I14 will engage the top of the fin material and thrust downwardly thereon. Upon further downward movement, cutting edge I68 will cooperate with cutting edge I62 so as to out the fin free from strip 8 except at its extreme ends, that is, the sides of strip 8. During this first cutting operation and for a short time thereafter, surface I14 has not reached the plane of surface I61 and cutting edges I12 and I66 have not yet come into cutting cooperation. Similarly, surfaces I16 have not reached the plane of surface I64, and cutting edges I15 and I63 cannot yet cooperate. During this short period of time after the center portion of the fin has been cut free and before surfaces I14 and I16 reach surfaces l61 and I64, respectively, the fin is pushed downwardly by surface I14, but is held at its ends (Figure 8) by the narrow and still uncut portions I80.

As cutter element I 54 moves further downwardly, cutting edges I66 and I63 meet cutting edges I12 and I15, respectively, so as to cut out a portion I at each side of strip 8 and thus' cut fin 9 entirely free from strip 8 and, at the same time, round the adjacent corners of fin 9 and the end of strip 8. These portions I80 fall upon-surfaces I65 and slide downwardly through passages I69 and (see Figure 2) through chutes I10 to container H1 in the bottom of the press.

Fin-positioning mechanism tinuously downwardly along one side of the U- tubes.

As best shown in Figure 2 followers 202 are mounted upon shafts 264 and are allowed to rock between the two positions shown, but are normally biased counter-clockwise to the position shown in the bottom half of the figure. There are a large number of identical followers and one will be described in detail, together with its mounting means.

The means for biasing follower 202 is shown best. in Figure 8 and is a spring 206 mounted upon the center of and attached at one end to shaft 204. The other end of spring 206 is attached to follower 202. The upper portion of follower 202 (see also Figure l0)'is provided with upon the fins in such a way as to avoid distortion of the fins.

Follower 202 also carries, along its center line, roller 299 which is rotatably mounted (see Figure upon a shaft 29! above and to the left of shaft 204. Referring now to Figure 8, freely mounted upon shaft 204 adjacent the inner end of sleeve Journal 244 is actuating roller 292. A web-supporting structure 24! connects sleeve journals 244 and 249 over the top of roller 290.

Shaft 204 is fixedly mounted at its two ends in link brackets 209 which are in pairs, each pair forming a link of one of the two endless chains 209. Upon the ends of shaft 204 are extensions upon which are mounted roller bearing elements 2" which are held by guide strips 2 so as to ride in vertical grooves 2l2 and 2l3. These grooves are in frame members 2 and 2|9, respectively, and guide the followers as they move downwardly along the side of the U-tubes.

- Referring to Figures 2 and 12, frame members 2 and H9 also act as mounting means for the other parts'of the follower control mechanism and for this purpose, mounted in bearings at the top and bottom of frame members 2" and 2i 9, and shafts M9 and 220. Upon shafts 2l9 and 229 are fixedly mounted two pairs of sprocket wheels 2" and 222, respectively, which carry endless chains 209, referred to above.

Supported by suitable web structure upon frame members 2 i4 and 2 l9, and located vertical- 1y therebetween, is slide support channel 224. As best shown in Figure 8, slide support channel 224 is substantially U-shaped in horizontal crosssection and its interior channel 229 provides a guideway for the reciprocating slide 223.

Reciprocating slide 229 comprises two side members 229 and roller strip face 230 which are 49 welded together and are reenforced (see Figure 9) at the top by cam member 23| and at the bottom by blocks 221 and 233.

Referring to Figure 12, mounted on the righthand side and near the top of slide 229 upon suitable adjustable mounting means is release pin 293, the purpose of which will be explained later. The mounting means for release pin 293 is shown in Figure 13 and comprises a fixed block 29l riveted to side member 229'upon which is adjustably 55 mounted an adjustable block 292. Upon the outer face of fixed block 29" are horizontal grooves 299 and upon the adjacent face of adjustable block 292 are cooperating teeth 299. Adjustable block 292 is provided with a vertical slot 291 which isadapted to receive set screw 299 which is screwed into fixed block 29!. Adjustment of release pin 292 is obtained by releasing set screw 299, positioning teeth 299 in the proper grooves 299 and then tightening set screw 299. Release pin 293 is hood-shaped and is mounted the positions in which the fins are placed on the U-members.

Slide 223 is adapted to move in channel 229 between the lower position, shown in Figure 11,

and the upper position, shown in Figure 2; and is held in channel 229 by three pairs of guide rollers 232 which are carried near the top, center and bottom of slide 229. As best shown in Figure 8, guide rollers 232 are held in channel 229 by guide plates 239 and, as shown in dotted lines in Figure 12, are carried upon the ends of pins 234.

Referringgalso to Figure 2, mounted in the back and extending from the bottom to a point slightly above the middle of channel 229 is rack 239. As best shown in Figure 9, pivotally mounted near the bottom and on the left side of slide 223 are two dogs 240 and 242 which are biased by springs 2 and 243, respectively, in a clockwise direction so thatthey tend to engage the teeth in rack 239. These teeth are shaped so as to have upper faces which are in alignment with the ends.

of the dogs which cooperate therewith; and thus, slide 229 is held from downward movement except when dogs 249 and 242 are withdrawn from their normal position. The lower faces of these teeth are inclined to permit the dogs 240 and 242 to slide over them when slide 223 moves upwardly.

As pointed out above, the followers may rock between two positions, and when in the extended position shown at the top of Figures 9 and 10 and in Figure 8, the paddles 249 extend outwardly to engage the fins as the fins are cutoff. In the retracted position shown at the bottom of Figures 9 and 10, the paddle is withdrawn and freed from the fins.

As best shown in Figure 2, as the followers are carried by chains 209 around sprocket wheels 2l3 they are in the retracted position and remain in that position until rollers 299 contact cam member 23! at the top of reciprocating slide 223. As each follower 202 reaches cam member 23!, its roller 299, riding upon cam member 23l, rocks follower 202 clockwise to its extended position. Upon further downward movement of follower 202, roller 290 will ride upon roller strip 230 and thus hold the follower 202 in its extended position.

Referring to Figures 9 and 12, pivotally mounted upon the bottom of slide 229 is pointed actuating arm 294, the pointed free end of which exupon a stud 294 which is screwed into block 292 and which is locked in place by tightening up release pin 293.

Reciprocating slide 223 acts as a control means to control the position of the followers as they move downwardly, rocking the followers in position to engage the fins and then allowing the followers to retract and release the fins at the tends downwardly and to the right (Figure 9) intothe path of rollers 292. Rotatably mounted between the two side walls 229 of reciprocating slide 229, upon a suitable bearingisee also Figure 8) carried by shaft 293, at a point below pivot 299 is bell crank 290 which has a vertical portion and a horizontal portion; the horizontal portion carrying at the end thereof pin 29I upon which is pivoted dog 240. Extending from the right side (Figure 12) of pointed arm 294 through a slot in the side wall 229 of slide 223 and into engagement with a groove in the top of the vertic;.l portion of bell crank 290 is actuating pin 29 Referring again to Figure 9, bell crank 290 and pointed arm 294 are normally biased, along with dog 240, by spring 2 to the position shown. As each actuating roller 292 is carried downwardly, it engages the free end of pointed arm 294 and rocks this arm clockwise. This movement of arm 294 is transmitted through pin 292 to bell crank 290 so as to cause bell crank 290 to rotate counproper points. Thus, slide 223 actually controls ter-clockwise. This movement of bell crank 290 causes the bell crank to pivot upon shaft 258 so as to thrust downwardly upon dog 248 and raise slide 228. As slide 228 rises, dog 242 slides over a suitable number of the notches in rack .238; and when actuating roller 252 passes the end of pointed arm 254, spring 24I returns dog 248, bell crank 288, and pointed arm 254 to normal position.

The movement of pointed arm 254 is such that dog 248 raises slide 228 a desired spacing of fins 9 upon U-tubes I, and it is thus seen that as each follower carries its actuating roller 252 past arm 254 the slide 228 is raised the distance of one fin from the adjacent fin and is retained in the new position by dog 242.

Considering now that the elements are in the position shown in Figure 9, the followers are held in their extended position as they pass slide 228 distance equal to the 18 and each is tilted back by its spring as its roller 20 258 clears the lower end of roller strip 238. Follower 282a is shown moving downwardly and is about to engage fin 9a which is about to be cut from strip 8. As surface I14 (see also Figure '7) moves downwardly so as to engage the upper surface of fin 9a, and cutting edges I88 and I82 start cutting the middle portion of fin 9a free, the paddle of follower 282aengages the top of fin 9a and pushes downwardly thereon. As explained the upper cutting member and follower 282a carry the fin downwardly, the fin is held at its ends by means of portions I88 and flanged holes in the fin are guided over the ends of U-tubes I (Figure 9) by round-nosed plugs I44. Upon further movement downwardly, cutting edges I12 and I15 cooperate with cutting edges I88 and I83, respectively, so as to cut the fin entirely free from strip 8; and the upper cutting member moves upwardly again, while the follower carries the fin downwardly along the tubes. In Figure 9, fin 9b has reached the desired position upon U- tubes HI and roller 258 upon follower 282b has cleared the lower end of roller strip 238 so as to allow follower 282D to be tilted backwards and web 241 has momentarily come in contact with block 233. When web 241 moves free of block 233, follower 282b will move to its retracted position. In Figure 9, follower 2820 has carried fin 9c to its proper position and is moving on downwardly. Above follower 282a, follower 282d is moving downwardly so as to receive the next fin which is to be cut from strip 8. Actuating roller 252d upon follower 28211 is about to engage pointed arm 254 and thereby elevate slide 228 a distance equal to the spacing between one fin and the adjacent fin. Follower 282a will, therefore, place fin 9a upon U-tubes I4I at a point properly spaced above fin 9b.

In the normal operation of the machine, at the time fins have been placed throughout the length of a set of U-tubes I4I slide 228 has been moved upwardly to the position shown in Figure 2 and the top of the slide engages set screw 284 which is adjustably carried in a vertically slidable bracket 288; and bracket 288 is moved upwardly. Movement of bracket 288 draws link above, (referring to Figures '7 and 8) as 50 288 upwardly which rotates lever 212 and shaft 218 to which lever 212 is plained later, this rotation of shaft 218 entire machine.

With the machine stopped in the position shown in Figure 2, the finished unit, comprising a set of U-tubes with the desired number of fins thereon, may be removed from the machine and keyed. As will be exstops the a new set of U-tubes may be properly positioned to receive fins. As best shown in the left-hand portion of Figure 9, horizontal shaft 218 is rotatably mounted and has rigidly mounted thereon arm 288, in the free end of which is fixed horizontal pin 282. Pin 282 engages a horizontal slot in the upper end of dog-disengaging bar 284 which is mounted in channel 228 (see also Fig-' slots 288 riding upon fixed pins 288, when raised,

moves to the right from the position shown in Figure 9 to the position shown in Figure 10. When moving to the right, the right edge of do disengaging bar 284 contacts the left side of the movable ends of dogs 248 and 242 and moves the dogs out of engagement with rack 238. Dogs 248 and 242 are, therefore, rendered ineffective, and slide 228 moves freely downwardly until block 233 engages the next follower below which is in its retracted position.

This movement of slide 228 is very slight but it is sufficient to move the top thereof (Figure 2) free from set screw 284 and the machine may now be started again. Referring to Figure 9, rockably mounted to the right of lever 288 upon slide support channel 224 is bell crank 289 which has a horizontal portion extending to the right (Figure 9) along the side of slide 228 into the path of release pin 293 (see Figure 12) which is fixed to slide 228. Bell crank 289 also has a latch portion extending upwardly and to the left (Figure 9). Fixedly mounted upon shaft 218 and extending into engagement with the end of the latch portion of bell crank 289 is latch dog 298. Bell crank 289 is biased by spring 298 so that its left end normally tends to move downwardly and so that when shaft 218 is rotated to release dogs 248 and 242 this latch portion falls behind latch dog 298, as shown in Figure 18. This engagement of the latch portion of bell crank 289 with latch dog 298 latches shaft 218, and with it dog-disengaging bar 284 and dogs 248 and 242, in the position shown in Figure 10 so that, even though the operator removes his hand from handle 214, dogs 248 and 242'are still held out of engagement with rack 238.

With the new set of tubes in position, and slide 228 resting upon follower 282, as shown in Figure 10, the machine may be set in operation and the chains will start lowering follower 282' and with it slide 228. During this movement downwardly, slide 228 holds a given number of the followers in the extended position, and as each follower passes the cutter it picks up a fin in the usual manner and carries it downwardly along the tubes, all as previously described. Referring to Figures 11 and 12, shortly before the leading fin reaches its proper position upon the U-tubes, release pin 293 engages bell crank 289, releasing latch dog 298 and allowing dog-disengaging bar 284 to drop so that dogs 248 and 242 re-engage rack 238, arresting downward movement of slide 228. The follower carrying the leading fin will, therefore, continue downwardly until its roller 258 moves free of slide 228 and the follower is rocked to its retracted position. As movement of the followers continues, a fol- 'U-tube holding mechanism The means for holding the U-tubes is best shown in Figures and 6 and comprises a fixed frame I8I which is built as part of the base of the machine and a sliding rack I42 which is adapted to receive a set of three U -tubes in each of its two sections. Sliding rack I42 is carried by frame I8I, the bottom of sliding rack I42 being held by retaining strip I84 so as to slide in track I83. Extending along the back (to the right in Figure 6) of sliding rack I42 is rigidly mounted a guide strip I85 which is T-shaped in cross-section and which slides in a corresponding groove in frame I8I. Rack I42 is thus rigidly held and adapted to be slid horizontally along the length of track I83 by either of handles I98,

and is limited in the two extremes of its movement by stop plates I91.

When rack I42 is in the position shown in Figure 5, the left-hand section thereof is positioned so that the set of U-tubes therein may receive fins; and the right-hand section is positioned so that the U-tubes, with fins placed thereon, may be removed and a new set of U- tubes placed therein. When placing the U-tubes in position, the bottom of the U-tubes is received in a suitably shaped recess I86 and the top is received by holding strip I81. Holding strip I81 is best shown in Figure 4, and is provided with three cut-out portions I81a, H311), and I81c, each of which receives a U-tube under slight tension.

A holding strip I81 is resiliently held in a horizontal position near the top of one side of rack I42 by means of a spring-pressed side bar I88. Each section of rack I42 is provided with a side bar I88, it being located in each case on the inside of the vertical wall of the rack (along the left wall of the left section and along the right wall of the right section) and supported by means of springs I89. Side bar I88 is adapted to push resiliently against one end of holding strip I81 so as to hold the other end thereof against the op posite side of the section. As the first fin moves downwardly upon a set of U-tubes, it will en gage the top of holding strip I81, moving it downwardly. After the first fin starts moving downwardly upon the U-tubes, the tops of the U-tubes will be held in position by thefin and it will be no longer necessary to hold the tops of the U-tubes by other means. Holding strip I81 is moved downwardly to the position shown in the righthand section of Figure 5, and may then be removed with the completed unit and may be replaced to its proper position so as to hold a new set of U-tubes.

Mounted in holes in guide strip I85 and on the center line of the left and right sections are sl eves I98 and I98, respectively, which are adapted to receive in their center holes locking pin I9I, which is slidably carried in sleeve I92 in fixed frame I8I. In Figure 5, pin I 9| is inserted in sleeve I98, thereby locking rack I42 in position. When desirable, pin I9I is withdrawn from sleeve I98, rack I42 is moved to the left, and pin I8I is inserted in sleeve I98. Rack I42 is thereby locked in the proper position for fins to be placed upon U-tubes in the right-hand section of the rack.

Locking pin I9I is moved to and from its locking position through a pin and slot connection by arm I93 which is rigidly mounted upon shaft I94. Shaft I94 is mounted in the base of the press and extends out at both sides so that it may be operated from one side (Figure 1) by a suitable handle I98, and from the other side (Figure 3) by handle I95.

Safety stop mechanism During the operation of this machine, it is desirable that the machine automatically stop in case of obstruction. A means for accomplishing this is shown in Figures 15, 16 and 17 and is means (shown also in Figure 1) for receiving power from the main drive shaft of the press through chain 3 and transmitting the power through another chain 389 to the upper shaft 2I6 of the fin-positioning means. Supported upon side frame member 2I4 by suitable spider structure is sleeve bearing 388. Suitably supported in a. like manner, concentric with sleeve bearing 388,

and extending through a hole 38I in side frame member 2I4, is sleeve bearing 382. Extending through bearings 388 and 382 is main drive sleeve 384. Sleeve 384 is held from endwise movement with respect to hearing 382 by thrust bearings 385 and 388. Keyed to the left end of sleeve 384 is main drive sprocket 3I8 which is driven by a chain 3 from the main drive shaft of the press (see Figure l).

Rotatably mounted on sleeve 384 adjacent thrust bearing 388 is driven sprocket 3I2 which, as best shown in Figure 16, has a hub portion 3I3 into the left end of which are cut a plurality of notches. These notches are each provided with one face 3, which is in a plane parallel to and extending through the axis of rotation, and one end sloping face 3 I 6. Slidably mou'nted upon sleeve 384 and having one face adjacent the notched end of hub 3I3 is collar 358. Collar 3I8 is provided with projections 3I9 which are of the same size and configuration as the notches in hub 3I3 so that the adjacent end faces of the hub 3I3 and collar 3I8 normally register with each other, there being faces 3I1 upon collar 3I8 to corre-' spond to faces 3I6 on hub 3I3. Referring to Figure 15, collar 3I8 is slidably keyed to sleeve 384 by means of key 328, so that collar 3I8 must rotate with sleeve 384 but may slide axially thereon. The center portion of collar 3I3 has an enlarged fiange thereon which is provided with suitable recesses to receive one end of each of a set of four springs 322. Adjustably mounted upon sleeve 384 and adapted to receive the other ends of springs 322 is spring-retaining collar 324. Extending radially through-slots 326 in sleeve 384 and rigidly mounted at its ends in collar 324 and at its center in adjusting bar 328 is pin 338. The left end of the hole in sleeve 384 is threaded and is provided with adjusting screw plug 332 and lock screw plug 334. In assembling the parts, adjusting screw plug 332 is turned into the threaded end of sleeve 384 until adjusting bar 328 is engaged and pushed to the right so as to i move pin 338 along slots 328, carrying collar 324 a distance sufficient to provide the desired tension upon springs 322. Look screw plug 334 is then turned tightly against screw plug 332.

Extending radially through slots 336 in sleeve 384 and rigidly mounted at its ends in collar 3I8 and at its center in operating shaft 338 is pin 348.

rately squares the ends. Handle 388 is then swung to the vertical position while the cut-off ends of the two strips are removed, and the advance end of the new strip is pushed in' so as to overlap the end of the old strip, as shown in Figure 22. As will be explained later, this overlapping is only enough to Take the stitch and is not enough to interfer with making the flanged holes in the strip. Handle 888 is now swung to the right, and movable stitcher element 858 is thereby moved downwardly to the position shown in Figure 23. This movement pushes the two strips downwardly, puncturing the two strips and displacing portions thereof, thereby making a stitch wherever there is a needle 360, as shown in Figure 23.

Mounted to the right (Figures 21, 22, and 23) of stitching needles 360 are releasing pins 408 which are similar in structure to cooperating pins 388 and are normally held in the position shown in Figures 20, 21 and 22 by springs 4| 0. When movable stitcher element 358 moves downwardly to the position shown in Figure 23, the material is pressed against pins 408 so as to depress them to the position shown.

As handle 388 is again moved to the vertical position, pins 408 push upwardly upon the material and release it from stitching needles 880; and pins 388 push downwardly within cutting sleeve 400 so-as to push the material therefrom.

The material is now free to be moved to the right by the normal operation of the machine, and as it does so there is some possibility that the stitches formed will be abnormally thick and will interfere with the movement of strip 8. To avoid this possibility and, at the same time, improve the stitches, mounted in line with stitching needles 880 are rollers 4I2. Rollers 2 are rotatably mounted upon shaft 4I4 which is held at'its ends by brackets 6 which are rigidly mounted upon base frame 384.

As suggested above, the spacing of stitching needles 360 and fin cutter I50 (Figure 2) is such that the line formed by the right-hand side of the stitcher heads 384 is later the dividing line be- 1 tween two fins. Thus, the cutter I50 will cut the material along the right-hand edge of the line of the stitches so as to free the two portions of the stitch which would otherwise cause a double thickness of metal in the fins. These portions which, in Figure 23, are the portion of the upper strip to the right of the right-hand edge of the line of stitches and the portion of the lower strip to the left of the right-hand edge ofthe line of stitches may then be removed and the edges of the fins may be smoothed out to the original position so as to eliminate practically all evidence of the stitches. The stitches formed thus perform the function of holding the two strips of material together during the time that the new strip is being threaded into the machine, but the stitches are not present in the final product.

Oiler As bestshown in Figures 1 and 2, mounted to the right side of stitcher 852 is oiler 1, the details of which are shown-best in Figures 18 and i9. Rigldly mounted upon a roller 422 in pan 4I8 are annular felt strips 420 and brake disc 424. Extending around brake disc 424 and tensioned by means of an adjustable spring 425 (see also Figure 1) to produce friction with brake disc 424 is band 428. Band 428 is attached to the side of pan M8 and is thus retained in fixed position. Pan 4I8 contains suitable oil, and as the strip of fin material rides upon felt strips 420 roller 422 revolves so as to carry the oil upwardly and apply it to the under-side of the strip. The tension upon band 426 may be ad- Justed so as to regulate the speed of rotation of roller 422 and thus control the amount of oil which is placed upon the strip.

Material holder The mechanism for holding the strip of fin material 8 in coiled form is holder I0, andis best shown at the right of Figure 1. In actual operation, holder I0 is located further to the right of press I00 than shown, the showing of Figure 1 being for convenience only.

Holder I0 comprises cylinder adapted to receive, by means of latches I2 which is and have latched thereon I4, coiled strip 8: Cylinder I2 is provided with suitable mechanism to control the unwinding of coiled strip 8 and is mounted upon post I8. Mounted on post I6 below cylinder I2 by means of bar I8 is a bracket structure which includes three horizontal rods 28, 22 and 24, two fixed angular rods 26 and 28 and a swinging U-shaped brake of tension member '30. Swinging U-shaped tension member 30 comprises two side bars which fit along the side of strip 8 and a top horizontal portion which normally lies against coiled strip 8, as shown. Strip 8 thus unwinds as it is used and is kept under constant tension.

Control mechanism The control mechanism comprises clutch means to connect the driving motor to the main power shaft and brake means which, in the present embodiment, is applied to the main power shaft whenever the motor is disconnected. All this is associated with various safety means which prevent the operator from starting the machine except when the machine is in proper condition and which stop the machine in case of trouble.

Referring to Figure 3, the fiy-wheel clutch (not shown), which, when in engaging position connects motor I40 to main power shaft I34, is moved to engaging position by a movement of rod 40 upwardly and is moved to disengaging position by movement of rod 40' downwardly. Rod 40 is carried at its lower end upon the end of pivoted arm 42 and at its upper end in control box 4I. Coiled about rod 40 near its lower end is spring 44 which is compressed between fixed U- member 48 at its bottom and collar 48 at its top. U-member 48 is mounted upon the base of press I00 and collar 48 is adjustably mounted upon rod 40. Spring 44 thus normally biases rod 40 in its upper position so as to tend to hold the control for fly-wheel clutch in the disengaging position. Arm 42 is pivoted upon stud shaft 50 and carries one end of bar 52. The other end of bar 52 is carried by the free end of arm 54 which is rigidly mounted upon control shaft 58.,

Control shaft 58 extends the width of the base of the press and has rigidly mounted thereon, in addition to arm 54, operating pedal 58, arm and (Figure 1) arm 82.

Rigldly mounted upon main power shaft I34 is brake drum 8|, around which is mounted brake 82. Brake 82 is mounted on the frame of press I00 and is normally retained in braking position by meansof spring 83 and is moved from braking position by the movement of cam arm 84 downwardly. Cam arm 84 carries at its outer end the upper end of brake control rod 85, the lower Shaft 338 is slidably mounted in sleeve 334 and has mounted upon the right end thereof bevel disc 342. Pin 343 thus limits the movement of operating shaft 338 and bevel wheel 342 to an axial movement a distance equal to the length of slots 338 and makes the position of bevel wheel 342 dependent upon the position of collar 318. Bevel wheel 342 may be moved by collar 318 from the position shown in Figure 15 to the position shown in Figure 16, but these elements are normally retained in the position shown in Figure 15 by springs 322.

Rotatably mounted in side frame members 214 and 215 adjacent bevel disc 342 is shaft 213, referred to above, upon which is rigidly mounted arm 346 which carries upon its free end, in the path of movement of the beveled .edge of disc 342, a roller 348. When bevel disc 342 is moved from the position shown in Figure 15 to the position shown in Figure 16, roller 343 is engaged and shaft 213 is rotated, moving handle 353 downwardly which, as .will be explainedlater, stops the operation of the entire machine.

In the normal operation of the machine, sprocket 313 moves clockwise (Figure 1), driving sleeve 334 which rotates collar 313 and through it hub 313 of sprocket 312, collar 313 being normally held in engaging relationship with hub 313 by means of springs 322. Thus, it W111 be seen that sprocket 312 is normally driven through engaging faces 316 and 311, previously described, the pressure upon springs 322 being adjusted by means of adjusting screw plug 332 so as normally to overcome the force tending to cause faces 311 to slide on faces 316. If, however, the operation of the machine is obstructed by abnormal load or otherwise, the force tending to cause faces 311 to slide on faces 316 will overcome the force of springs 322 and collar 318 will slide to the left against the pressure of springs 322 to the posi- "tion shown in Figure 16. Sprocket 312 will,

therefore, cease rotating and the fin-positioning means will stop. At the same time, this movement of collar 318 is transmitted through pin 343 to operating shaft 333 with the result that bevel disc 342 is moved to the left. As bevel disc 342 moves to the left, it engages roller 348 and pushes upwardly thereon so as to rotate shaft 213 and move handle 353 downwardly so as to stop the machine.

It is thus seen that this drive means will carry a normal load, but if an abnormal load is en-'- countered the entire machine will be stopped. An example of such an abnormal load would be the machine jamming, due to the fins not moving properly downwardly upon the U-tubes.

Stitching mechanism Referring to Figure 2, mounted upon the right side of the base of the press, and in the path of the strip of fin material 8 is stitcher 352 which is used, whenone strip of material is exhausted, to fasten the end of the exhausted strip to a new strip. As best shown in Figures 21 and 22, the stitcher includes a movable cutter element 354, a movable stitcher element 356, and a fixed cutter element 358, in which are mounted a plurality of stitching needles 363. The fixed cutter element 358 is rigidly mounted upon .base 362, and the movable elements 354 and 356 are mounted for limited vertical movement upon base frame 364. The movable elements 364 and 356 are each mounted by means of a plurality of screws which extend downwardly through base frame 334.

- The left-hand side of Figure 23 is cut away so as to show one of screws 363, the lower end of which is securely threaded in movable stitcher element 336 and the head of which snugly fits the enlarged upper portion of hole 333. Coil spring 313, within hole 333, exerts pressure upwardly on the head of screw 363 so as to tend to retain screw 363, and thus movable stitcher element 356, in the upper position shown in Figures 20, 21 and 22.

The upper right-hand side of Figure 20 is cut away to show one of screws 312, which are identical with screws 363 and are mounted in holes 314 with springs 313 so as normally to retain movable cutter element 334 in the upper position shown in Figure 22.

Referring to the upper portion of Figure 20 and to Figure 18, rockably mounted in recesses 313 upon pivots 383 and normally positioned as shown in Figure 18 are two cam arms 382 and 334. These cam arms are connected to each other by means of bar 336; and cam arm 334 has handle extension 388 thereon which is used to operate both of the cam arms. On the lower end of each of these cam arms 382 and 334 are two cam portions which are selectively used to operate either movable cutter element 354 or movable stitcher element 356. As shown in both Figures 20 and 21, the left-hand cams 333 are positioned so that when handle 388 is swung to the left (Figure 20) cams 333 move cutter element 354 downwardly, from the position shown in Figure 22 to the position shown in Figure 21. Right-hand cams 332 are so positioned that when handle 338 is swung to the right cams 332 move stitcher element 356 downwardly, from the position shown in Figure 22 to the position shown in Figure 23. Thus, when handle 388 is moved to the left the cutter mechanism is operated, and when handle 338 is moved to the right the stitcher mechanism is operated.

As best shown in Figure 23, each of stitching needles 363 is provided with a head portion 334 which has an inclined upper face 336, the edge of which is a cutting edge. Mounted in movable stitcher element 356 directly above each stitching needle 363 is cooperating pin 333 which is surrounded by cutting sleeve 433. Cooperating pin 338 terminates at its upper end in a head which is slidably positioned in the enlarged upper portion of hole 432. Retained above pin 338 in hole 432 by means 'of screw plug 434 so as to bias pin 338 in its downward position is coil spring 436. As movable stitcher element 356 moves downwardly, the inner edge of cutting sleeve 433 cooperates with the top portion of the cutting edge of head 334 and the material therebetween is pierced. Upon further movement downwardly, movable stitcher element 356 comes to the position shown in Figure 23 wherein a portion of thematerial is projected upwardly in the hole in cutting sleeve 433 by head 334 so as to displace cooperating pin 333 upwardly. The lower face of movable stitcher element 356 is pressed tightly toward the upper face of fixed element 358 so as to compress the material therebetween.

In operation, shortly before the end of an exhausted strip of material reaches stitcher 352, the forward end of a new strip is placed on top of the rear edge of the exhausted strip to the extent shown in Figure 21, and handle 338 is swung to the left. This movement of handle 388 to the left cuts off the ends of the two strips of material, as shown in Figure 21, and accubrake control rod v 2,247,730 end of which is carried by arm 52. When openating pedal 58 is pushed downwardly so as to rotate control shaft 55 to the rumiing position, 95 is pulled downwardly so as to operate cam arm 92 from brake drum 9|. When control shaft 55 then rotates to the stopped position, cam arm 94 will be moved upwardly and spring 93 will again be allowed to apply brake 92 to brake drum 8|.

Brake 92 is, therefore,.released and motor I49 is connected to main power shaft I34 whenever operating pedal 58 is'pushed to its down position; and brake I49 is disconnected whenever operating pedal 58 is moved to its up position. Due to the biasing of rod 49 by spring 44 and the biasing of brake 92 by spring 93, the flywheel clutch and brake 92, and with them control shaft 55, are normally retained in the stopped position of the press.

Referring again to Figure 3, arm 59 carries at its free end one end of latch-operating rod 54, the other end of which is carried by latch 55 which acts as latching means to latch the press in either the Latch 55 is pivotally mounted upon stud bolt 58 so as to be in the position shown in Figure 3 when the press is stopped, and so as to be moved to the position shown in Figures 3b and 30 when the control of the press is moved to the running position.

As pointed out above in connection with the description of the movement of sliding rack I42 (Figures 5 and 6), when handle I95 is in the down position, shown in Figure 3, pin ml is properly positioned in one of the two sleeves I99 or I99, showing that sliding rack I42 and thus a set of U-tubes are properly positioned. If handle I95 is moved to its upper position, shown in dotted lines in Figure 3, pin I9I will be withdrawn and sliding rack I42 will be free to move. It is desirable that the machine not be started except when sliding rack I42 is locked in a proper position by pin I9I.

To perform this function, extending downwardly from handle I95 is operating rod 18 which is connected at its lower end through pivot pin 16 to the left end of latch bar 19 which is pivoted on stud 12 and in the right end of which is formed a notch 14. With latch 55 in the stopped position, shown in Figure 3, when handle I95 is raised so as to withdraw pin I9I notch 14 falls over the end of latch 55 so as to prevent clockwise rotation of latch 55. It will thus be seen 94 and thus release brake 92 is immediately applied and motor stopped or running condition nected through a free end with operating arm 82. Operating arm 82 is rigidly mounted upon shaft 84 which has rigidly mounted thereon arm 85. Arm 85 is connected through rod 88 to operating handle 359. which, as pointed out above, is rigidly mounted upon shaft 219. Attached at one end to handle 359, and at the other. end to side frame member H5, is spring 99 which normally biases handle 359 upwardly. It will be seen that when latch 55 is moved clockwise from the position shown in Figures 3 and 3a to the running position, shown in Figure 3b, spring 99 will pull upwardly upon handle 359, thereby carrying rod 88 and arm 85 upwardly and rotating shaft 84 and arm 82 counter-clockwise so that latch arm ,89 will fall and notch 8| will catch on the left side of latch 55, as shown in Figure 3b. Latch 55, and with it latch operating rod 54, arm 59 and operating shaft 55, will thus be retained in the running position by latch arm 89.

As pointed out above description of the normal stopping of the machine when a unit is completed and the stopping of the machine by the safety stop mechanism, if shaft 219 is rotated so as to push downwardly on handle 359 latch arm 89 will be raised and, due to the action of springs 44 and 93, control shaft 55' will be moved to the stopped position.

In accordance with the provisions of the patent statutes, I have described the principles of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown and described is only illustrative and that the invention may be carried out by other means.

I claim: e

1. In a device for assembling fins upon tubes to form a heat exchange apparatus, the combination of, means to hold the tubes in proper position, an endless chain, means to carry said endless chain including a plurality of wheels, fol- I lower members rockably mounted upon said that when pin I9I is withdrawn, latch 55, latch operating rod 54 and arm 59 will be held fixed, thereby preventing movement of control shaft and the machine cannot be started.

During the time that the machine is running, it would be undesirable to withdraw pin I9I because of the possibility of accidental movement of sliding ra'ck I42. With the machine in the running position, latch 55 will be in the position shown in Figure 3c; and any attempt to pull up on handle I95 will cause the right end of latch bar 19 to engage the top of latch 55, as shown in Figure 3c, and so prevent handle I95 from being moved enough to withdraw pin I9I. Operating rod 18, latch bar 19, latch 55 and latch operating rod 54, therefore, cooperate so as to prevent the starting of the machine after pin I9I is withdrawn and so as to prevent the withdrawal of pin I9I while the machine is running.

Freely mounted upon stud bolt 12, between latch bar 18 and the side wall, is latch arm 89 which, as best shown in Figures 3a and 3b, is conchain, the chain being movable about the wheels and one run of the chain being so located as to carry the follower members parallel to and along the length of the tubes, means to normally bias the follower members into a retracted position away from the tu runner means movably mounted adjacent the tubes along which the follower members run and are thereby held in an extended fin engaging position as they move along the tubes, means to place fins adjacent the ends of the tubes in the path of the follower members when they are in the extended position so that the follower members move the fins onto the tubes, means for actuating the chain in one direction for so moving the follower members, and means for moving the runner means in the opposite direction, said movement being so 00- ordinated that the runner means moves out of the way of one follower means after another to release the same and deposit fins at spaced intervals along the tube:

2. Apparatus as recited in claim 1 in which there is constant relative movement between the individual fins and the tubes and in which the means for moving the runner means includes means adapted to be engaged and operated by each of the follower members as the follower pin and slot connection at its in connection with the t tion,

3. In a device for to form a heat exchange apparatus, the combination of, means to hold the tubes in proper posian endless chain, means to carry said andless chain including a plurality of wheels, follower members rockably mounted upon said chain, the chain being movable about the wheels and one run of the chain being so located as to carry the follower members parallel to and along the length of the tubes, means to normally bias the follower members into a retracted position away from the tubes, runner means including a trip portion and movably mounted adjacent the tubes along which the follower members run and are thereby held in an extended fin engaging position as they move along the tubes with each follower member releasing its fin when it moves past said trip portion, means to place fins adjacent the ends of the tubes in the path of the follower members when they are in the extended position so that the follower members move the fins onto the tubes, means for actuating the 3,247,730 assembling fins upon tubes results in the lifting of said runner member one -ste chain in one direction for so moving the follower members, and means for moving the runner means with the eifect that the trip portion moves in the opposite direction, said movement being so coordinated that the runner means moves out of the way of one follower means after,

another to release the same and deposit fins at spaced intervals along the tube.

4. In a device for assembling fins upon tubes,

. the combination of: an endless chain mounted to be moved with one run of the chain moving along the tubes; a plurality of follower members rockably mounted upon said endless chain to receive fins and move them individually to their proper positions upon the tubes; said follower members being mounted so that they may be moved from a normally retracted position to an extended position where they engage the fins; and means to control the distance that each follower member moves its fin including, a runner member to hold the follower members in an extended position so that they are adjacent to the tubes, said runner member havinga track against which the follower members ride with the follower members being thereby held in their extended position; and means to impart stepby-step movement to said runner member comprising, a stationary vertically extending rack, a dog assembly carried by said runner member and including a first dog and a second dog both of which are resiliently held engaged with said rack to thereby prevent the downward movement of said runner member, said dog assembly including a mounting means for said second dog formed by a swinging pivot carriedby a bell crank pivotally mounted on said runner member, and an actuating arm rockably mounted on said runner member and having a mechanical connection with said bell crank so that when said actuating arm is rocked said bell crank is also swung to thereby move said swinging pivot for said second dog with the result that when said actuating arm is oscillated said second dog enages said rack and moves said runner member upwardly in predetermined steps and so that in between these steps said first dog prevents the downward movement of said runner member, said actuating arm having its end positioned in the path of movement of said follower members so that said actuating arm is oscillated as each follower member passes whereby the movement of a follower member along said runner member 5. Apparatus as cludes,

. eallyreengaged.

lower members during its upward advancementto successively eifect the retraction of said fol-' lower members atspaced points.

8. Apparatus as described in claim 7 in which the means for moving the element having the trip portion is operated by the movement of the follower members.

9. Apparatus as described in claim 7 in which control means is provided including, means to prevent the starting of the means to move the follower members except when the tube-holding means is properly positioned, means to stop the operation of the requires a predemounted to be moved along the tubes substantially throughout the zone where fins are to be deposited, and means to move said control means in opposite direction to the movement of said follower members. step equal to the spacing between the fins on the tubes, and said control means being so constructed as to eflect a retraction of an advancing follower member at each step and maintain the follower members moving behind the same in extended position.

WILLIAM L. O 'BRIEN.

said movement being in steps with each 7 

